Dealing with Sexual Pressure in a Relationship

TW SH. A while ago me and my boyfriend had a talk about how I don’t like being sexualized. (I have been sexually abused in the past by other people). He was constantly humping me at any point of the day and it was triggering me so much. He agreed to stop and will wait for me to initiate any kind of sexual stuff. Which was working for a while.. but on Saturday he started doing it again. He only did it on that day, but still. He was pushing to have sex a lot that day and was acting very sexually frustrated. I couldn’t speak up for myself tho. I didn’t want to have sex, but I did so he would leave me alone… I feel like a terrible person for doing that honestly. He even said “ you can say no” but he would whine about wanting to have sex with me and how he was tired of masturbating. Keep in mind, we might’ve not had sex for a week and I’ve been having a lot of health issues which has been preventing me from wanting to have sex. Idk if anyone will respond to this, but I feel stuck in a place where I can’t talk to him about it or I’m gonna blow up on him. He can be very sweet but if he continues to do this idk if I can be with him anymore. I just need some advice on what to do about this..